Portugal captain Cristiano Ronaldo says Brazil, Argentina, Spain and Germany are the favorites to win the World Cup this summer.

The 29-year-old came through a dramatic play off with Sweden - in which he scored a hat trick in the second leg of the two-legged tie - to secure his place at the tournament with the Seleccao. But Ronaldo believes the weight of expectation will be far greater for the four leading contenders after dismissing any suggestion Portugal could be considered a dark horse in the competition.

"I hope we have a great World Cup, we aren't under pressure as the favorites are Brazil, Spain, Argentina and Germany. The first game is important as it is against a big nation in Germany," Ronaldo said after being unveiled as a global ambassador for Fly Emirates.

The former Manchester United man became his nation's all-time top goalscorer after scoring twice in the 5-1 friendly win over Cameroon earlier in March, taking his tally to 49 goals in 110 international appearances.